63 lines
2.2 KiB
TypeScript
63 lines
2.2 KiB
TypeScript
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import {
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CdkFixedSizeVirtualScroll,
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FixedSizeVirtualScrollStrategy,
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VIRTUAL_SCROLL_STRATEGY,
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} from '@angular/cdk/scrolling';
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import {
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Directive,
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forwardRef,
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} from '@angular/core';
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// Custom virtual scroll strategy for cdk-virtual-scroll
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// Uses a sample list item to set the itemSize for FixedSizeVirtualScrollStrategy
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// The use case is the same as FixedSizeVirtualScrollStrategy, but it avoids locking in pixel sizes in the template.
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export class CipherListVirtualScrollStrategy extends FixedSizeVirtualScrollStrategy {
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private checkItemSizeCallback: any;
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private timeout: any;
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constructor(itemSize: number, minBufferPx: number, maxBufferPx: number, checkItemSizeCallback: any) {
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super(itemSize, minBufferPx, maxBufferPx);
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this.checkItemSizeCallback = checkItemSizeCallback;
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}
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onContentRendered() {
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if (this.timeout != null) {
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clearTimeout(this.timeout);
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}
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this.timeout = setTimeout(this.checkItemSizeCallback, 500);
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}
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}
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export function _cipherListVirtualScrollStrategyFactory(cipherListDir: CipherListVirtualScroll) {
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return cipherListDir._scrollStrategy;
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}
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@Directive({
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selector: 'cdk-virtual-scroll-viewport[itemSize]',
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providers: [{
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provide: VIRTUAL_SCROLL_STRATEGY,
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useFactory: _cipherListVirtualScrollStrategyFactory,
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deps: [forwardRef(() => CipherListVirtualScroll)],
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}],
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})
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export class CipherListVirtualScroll extends CdkFixedSizeVirtualScroll {
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_scrollStrategy: CipherListVirtualScrollStrategy;
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constructor() {
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super();
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this._scrollStrategy = new CipherListVirtualScrollStrategy(this.itemSize, this.minBufferPx, this.maxBufferPx,
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this.checkAndUpdateItemSize);
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}
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checkAndUpdateItemSize = () => {
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const sampleItem = document.querySelector('cdk-virtual-scroll-viewport .virtual-scroll-item') as HTMLElement;
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const newItemSize = sampleItem?.offsetHeight;
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if (newItemSize != null && newItemSize !== this.itemSize) {
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this.itemSize = newItemSize;
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this._scrollStrategy.updateItemAndBufferSize(this.itemSize, this.minBufferPx, this.maxBufferPx);
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}
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}
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}
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